Air heater



June 24,1930.' E. HA\BER 1,7 65,916

AIR HEAT R Filed June 14. 1926 Inventory a ,Jun

Patented June 24,1930

*ZUN TED[S ATES 2 ZEUGEN HABER,. or BERLIN-oHARLoTTENBUnG, GERMANY AIR HEATER 'Applieation filedinne 14,1926, Serial No. 1 16 ,050, and in Germany February 18 .l

` It has become known` to! use, for the utilization of waste gases comin'g directly'from furnaces high degrees of'heat, masonry heating ovens alone or in 'combination with 4 5 cast iron heaters connected behind said heat- 'n order to economize .the oonsiderable expenses for masonry heating ovens they are suppre'ssed a'nd metal heaters are *used exclusively for which, according. to the invention, a new working method 'is applied.

The metal heater s' used according to the invention are 'ofthe type' describeddand shown in my prior Patent 'No. 1,635,838; These heat exchanging bodies are Composed each of'a number of 'sheet "metal plates the two 'heat exchanging media 'flowing along the, two surfaces oteachf ofthese 'sheet metal plates in cross current sothat alternating 'intersecting 'channels forthe heat exchanging media are produced in theclosed body, these bodies being` adaptedto be con'- nected the one with thesother'by means 'of similar rectangular end-fianges to form z groups to be connected with tubular connections. r

According' to' this method the heating gases are maintained, in a' closed channel containing the heat exchanging elements, at

a continuous rolling flow by means of a fan, the admission of fresh heating gases taking place in the suction zone of this rolling flow and the discharging of the cooledgases in the pressure zone. The asadmission and discharge is preferably eected centrally to the circulating flue so that the circulating gas quantity remains' always constant even if an auxiliary cooling means issucked in at the same time. r

For carrying out this working method an air heating plant is used in which the open ends of the heating gas channels of the heat exchanging bodies which. are arranged in pairs, are connected at both ends by connecting tubes in such a manner that a closed circulating channel is formed, the short connecting tube serving to accommodate the blower, and the other tubular conduits for regulating means maybe arranged; I

the gas admission and discharge in` which The newlplant is shown,"by way of example,.diagrammatically in the only figure of the accompanying drawing. i

Theheating plantconsists of two heat exchanging elements a b working at circulating current, or of two groups of such elements`,through which the air to be'heated or anyother fiuid flows in horizontal direction," preferablyin the direction. of the arrows c'. The channels 'for the heating gases or flue gases, 'for whichsteam 'mightbe' substituted, extend perpendicular to the V air channels' and 'they are connected at the 'upper ends b 'a curved tube d 'in' the'wall of. which a horizontal shaft e' is journal led, on' which a fan .f and on the outerfree end of said shaft a driving pulley g are mounted To each' of the bottom' plates of the two elements a and b -alonger tube h is connected which, together with the elements wand b and the connecting tube d, form a closed] .circulating channel. Into the tube hprojects a pipe ?l havinga central mouth j and designed for supplying the heating gases from^ any source of'heat, 'for instance an oven k or a 'heat accumulator theTtemperae tures of said heatinggases amounting to 800 to 1000` C. or more.` Thecooled'heating gases are' discharged' from' the other arm of tube h'through a pipem having' also a 'een-j tral mouth "771. The two arms of tubei h are* narrowed* at 0 above the open ends'j and n, of pipes ?I and m in order to obtain an' ejat-. tor or suc'tion pipe effect. The pipes z' and m comprise further reg ulatingelements'p,'as sllding dampers' or r the 'like, which are preferably positively connectedthe one with'the other.

A- supplying tube 7"' for a cooling medium, y

' The operation of the plant is follows r As soon as the .fan f has been-started the contents of the circulating channel is moved so that'a circul'ating current isproduced. Fresh heating .gases are sucked. in at same timefrom the supplyipipe i whilst on -Ifthe pressure side a similar quantity of gases is discharged through the pipe m' said gases 1 having been utilized and Cooled. T he fresh heating ,gases prior'to coming into contact with thewalls of the. heat exchanging ele- ;ment bhave beenpartly 'Cooled by mixing with the' existing ,circulating current so that -the surfaces are protected against 7 .jburning. The quantity of the gases nay ifurther` be* lowered, prior to entering' into .the elements, by: sucking i in `of:. fresh air through the tube?" or TC 'peraturegof the heated 'air, 'the air *to be beiusedwhich win b ,While theinvention g V an invention for 'heatingair by means oit V heated flowingtransvensal to 'the circulating hot [waste gases, the apparatus ,is also l "adapted to be employedi for numerous pure poses for which simple prelimin ary heaters for'ainor Water arenot adapted, `The in Vention 'my be used 'asa `condenser for ,steam turbines and engines for an air cooler in aclosed. system ;for icontinuou sly'f circulat cooling air' through generator windings of turbines, andgas ;a en ram ferblast furnaces to preeheat the air .introduced `thifo ugh' thei tuyeres by the hot waste gases.

'The' apparat us,"which can be cheaply manufactured, is adapted to replace Costly fire r brick structures .now employed" in recuperdi r I'claim i g a ators.

1. ,An apparatu' of hot `wastegases, comprising incornbinat on pan* of ;heat exchanging 'elements 'arranged s for heating airby means r nels, a short tube connecting the upper open,

ends of said gas hhannels, a fan mounted* l insaid short connecting tube for accelerating the circulation of the gas in sa1dc1osedgas channel, a long' tube* ;connectinggthe lower open ends of said 'heating gas chan-f nels of'said two'heatingelernents said short and long tubes forining together with the r .gas channels a closed channel fei-"agas flow, a' gas supply pipe connected tOSalCl long .connecting `tube narrowerithan' said' long connecting tube and concentric to the same,.

'a dis'charging pipe connectedto said,

long connecting tubeopposite'the point at which sald gas supplypipej is connected concentric to the same and an air discharge tube connected to ,the corresponding ends of V the air channels in said aii" heating' elements, and regulating elements. insaid gas supply and. discharging pipes;

3. In an appar tus for heatingv air as specified in claim 2 ,the arrangement that I the 'long connecting tube has narrowedporg tiens above the conc entr c,gas supplyv and hscharging p pes. i

, 4."ln' an apparatus ;for heating air as 'specified in cla m 2 in combination Vflil'l'ililc v gas supplypipe la supply pipe for fresh aii' v' concentrically to, said gas supply pipe.' r I' 5. Inan apparatus forheating air by *meansof 'hot "waste gasesas specified in Vclaiin '2, the arrangement of a sliding damperin the discharging pipe fonregulating` the' volume of, the coole'df gases, discharged and the Volume-of the gases returned.. N I I 'v ,In testiinony \Vhe1*eof' I 'affix my signature.

EUGEN HABER.

working n cross' 'current and: each having gasichannels open at bothends and air chan- ,'nelsg a short tube connect ng the upper open ;ends of sa d heating 'gas channels, a' long tube connecting the lower* openends of said gas chann ls of sa d wd t g* n s said short anl long tubes forining together with ,the gas'channels, a'closedchannel for a gas' flow, a gas supply pipe connectedto i said long connecting tube, a gasdischarging pipeconnected to said long connectingtube opposite thepoint which said gas supply pipeis connectechzmeans .for propelling the 4 ..&

gas in the closed-channel formed by said cgnnecting'tubes and by said gas channels in said heatexchanging elements, an air supp' lytube, andan air discharging tube cou- ;nected to the corresponding ends of theair I QQ:

channels said air 'heating elements.

v An apparatusfor heatingairby ineans of hot Waste gases, ,compr sing in combina ti on a' .pair of ;heat exchanging. elements Working 111 cross 'current and each having gas channelsop en at both ends and airchan- 

